If it took 15 workers 20 day, and you want to split it so it gets done in 10 days, you would want 15 more workers to get the job done quicker, doing this would have you a total of 30 workers.
That means that 4 out of 11 people did not have umbrellas You can write this as a fraction so 4/11 = x/99 Then, multiply both sides by 99 to isolate the variable. So x is going to equal 99 times 4 divided by 11, which is 36. That means 36 people did not have umbrellas.
